SSO Refactoring (#2818)

# Description of Changes

* Refactoring of SSO code around OAuth & SAML 2
* Enabling auto-login with SAML 2 via the new `SSOAutoLogin` property
* Correcting typos & general cleanup

---

## Checklist

### General

- [x] I have read the [Contribution
Guidelines](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/CONTRIBUTING.md)
- [x] I have read the [Stirling-PDF Developer
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md)
(if applicable)
- [x] I have read the [How to add new languages to
Stirling-PDF](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md)
(if applicable)
- [x] I have performed a self-review of my own code
- [x] My changes generate no new warnings

### Documentation

- [x] I have updated relevant docs on [Stirling-PDF's doc
repo](https://github.com/Stirling-Tools/Stirling-Tools.github.io/blob/main/docs/)
(if functionality has heavily changed)
- [x] I have read the section [Add New Translation
Tags](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/HowToAddNewLanguage.md#add-new-translation-tags)
(for new translation tags only)

### UI Changes (if applicable)

- [ ] Screenshots or videos demonstrating the UI changes are attached
(e.g., as comments or direct attachments in the PR)

### Testing (if applicable)

- [x] I have tested my changes locally. Refer to the [Testing
Guide](https://github.com/Stirling-Tools/Stirling-PDF/blob/main/DeveloperGuide.md#6-testing)
for more details.

src/main/java/stirling/software/SPDF/config/security/SecurityConfiguration.java

@@ -1,6 +1,6 @@
 package stirling.software.SPDF.config.security;
 
-import java.util.*;
+import java.util.Optional;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
@@ -51,11 +51,7 @@ public class SecurityConfiguration {
 
     private final CustomUserDetailsService userDetailsService;
     private final UserService userService;
-
-    @Qualifier("loginEnabled")
     private final boolean loginEnabledValue;
-
-    @Qualifier("runningEE")
     private final boolean runningEE;
 
     private final ApplicationProperties applicationProperties;
@@ -109,6 +105,7 @@ public class SecurityConfiguration {
         if (applicationProperties.getSecurity().getCsrfDisabled() || !loginEnabledValue) {
             http.csrf(csrf -> csrf.disable());
         }
+
         if (loginEnabledValue) {
             http.addFilterBefore(
                     userAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
@@ -164,8 +161,7 @@ public class SecurityConfiguration {
                                     .logoutSuccessHandler(
                                             new CustomLogoutSuccessHandler(applicationProperties))
                                     .clearAuthentication(true)
-                                    .invalidateHttpSession( // Invalidate session
-                                            true)
+                                    .invalidateHttpSession(true)
                                     .deleteCookies("JSESSIONID", "remember-me"));
             http.rememberMe(
                     rememberMeConfigurer -> // Use the configurator directly
@@ -227,14 +223,14 @@ public class SecurityConfiguration {
                                         .permitAll());
             }
             // Handle OAUTH2 Logins
-            if (applicationProperties.getSecurity().isOauth2Activ()) {
+            if (applicationProperties.getSecurity().isOauth2Active()) {
                 http.oauth2Login(
                         oauth2 ->
                                 oauth2.loginPage("/oauth2")
                                         .
                                         /*
                                         This Custom handler is used to check if the OAUTH2 user trying to log in, already exists in the database.
-                                        If user exists, login proceeds as usual. If user does not exist, then it is autocreated but only if 'OAUTH2AutoCreateUser'
+                                        If user exists, login proceeds as usual. If user does not exist, then it is auto-created but only if 'OAUTH2AutoCreateUser'
                                         is set as true, else login fails with an error message advising the same.
                                          */
                                         successHandler(
@@ -258,8 +254,7 @@ public class SecurityConfiguration {
                                         .permitAll());
             }
             // Handle SAML
-            if (applicationProperties.getSecurity().isSaml2Activ()) {
-                // && runningEE
+            if (applicationProperties.getSecurity().isSaml2Active() && runningEE) {
                 // Configure the authentication provider
                 OpenSaml4AuthenticationProvider authenticationProvider =
                         new OpenSaml4AuthenticationProvider();
@@ -284,12 +279,13 @@ public class SecurityConfiguration {
                                                 .authenticationRequestResolver(
                                                         saml2AuthenticationRequestResolver);
                                     } catch (Exception e) {
-                                        log.error("Error configuring SAML2 login", e);
+                                        log.error("Error configuring SAML 2 login", e);
                                         throw new RuntimeException(e);
                                     }
                                 });
             }
         } else {
+            log.info("SAML 2 login is not enabled. Using default.");
             http.authorizeHttpRequests(authz -> authz.anyRequest().permitAll());
         }
         return http.build();
@@ -315,7 +311,7 @@ public class SecurityConfiguration {
     }
 
     @Bean
-    public boolean activSecurity() {
+    public boolean activeSecurity() {
         return true;
     }
 }